| Acronym | Meaning |
| PIT | Phase Inversion Temperature |
| HFI | Hyperfine Interaction |
| EDWA | Exponential Distorted-wave Approxn. (atom-ion Electron-exchange Calcns.) |
| RTF | Replenished Tapped And Fractionated (magma) |
| DDE | Dichlorodiphenyldichloroethylene |
| IMPDH | Inosine-5'-monophosphate Dehydrogenase |
| SPIN | Silica Phase-immobilized Nitroxide |
| J(Z)CCS | J(z)-conserving Coupled States Method (for Rotationally Inelastic Atom-molecule Collisions |
| AIBS | American Institute Of Biological Sciences |
| BTDC | Before Top Dead Center |